fix(editor): batch initial collaboration projections atomically - #587
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Initial collaboration sync previously committed each projected row separately, repeatedly notifying editor subscribers and pruning selection. Collect initial socket tasks over a 16 ms frame and commit the rows and shell together. Keep write gates closed until the server seed has reached the store, while retaining microtask projection for live peer edits and synchronous undo/redo. Extract document projection from the binding into its own module.
Regression coverage verifies a 30-page burst causes one site update, rejects a premature write, exposes all server titles when the write waiter resolves, and still projects live edits in the next microtask. Verified with bun test (7,054 passed), bun run build, bun run lint and git diff --check. Full large-site browser responsiveness remains under investigation. No database changes.